linux-kernel - Re: [PATCH] dm: allow error target to replace either bio-based and request-based targets

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Message-ID: <5216B578.5050506@oracle.com>
Date:	Fri, 23 Aug 2013 09:06:00 +0800
From:	Joe Jin <joe.jin@...cle.com>
To:	Mike Snitzer <snitzer@...hat.com>
CC:	Mikulas Patocka <mpatocka@...hat.com>,
	device-mapper development <dm-devel@...hat.com>,
	Alasdair Kergon <agk@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] dm: allow error target to replace either bio-based and
 request-based targets

On 08/23/13 08:17, Mike Snitzer wrote:
> Here is a patch that should work for your needs (I tested it to work
> with 'dmsetup wipe_table' on both request-based and bio-based devices):

This really what I looking for, thanks!

> 
> From: Mike Snitzer <snitzer@...hat.com>
> Date: Thu, 22 Aug 2013 18:21:38 -0400
> Subject: [PATCH] dm: allow error target to replace either bio-based and request-based targets
> 
> In may be useful to switch a request-based table to the "error" target.
> Enhance the DM core to allow a single hybrid target to be capable of
> handling either bios or requests.
> 
> Add a request-based (.map_rq) member to the error target_type and train
> dm_table_set_type() to prefer the md's established type (request-based
> or bio-based).  If the md doesn't have an established type default to
> making the hybrid target bio-based.

Signed-off-by: Joe Jin <joe.jin@...cle.com>

Thanks,
Joe
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